/Engine/Plugins/FastBuildController/Source/Public/FastBuildJobProcessor.h
enum EFASTBuild_ReturnCodes { FBUILD_OK = 0, FBUILD_BUILD_FAILED = -1, FBUILD_ERROR_LOADING_BFF = -2, FBUILD_BAD_ARGS = -3, FBUILD_ALREADY_RUNNING = -4, FBUILD_FAILED_TO_SPAWN_WRAPPER = -5, FBUILD_FAILED_TO_SPAWN_WRAPPER_FINAL = -6, FBUILD_WRAPPER_CRASHED = -7, }